The Bridgeport Torq-Cut 22 is a smaller CNC vertical machining center. It comes fitted with a grease lubricated and belt driven spindle capable of running up to 7,500 rpm.
Read MoreDaewoo DHP 5000 Spindle Repair
The Daewoo DHP 5000 is a large CNC horizontal machining center with a built in pallet changer. The spindle that comes standard with the machine is a grease lubricated spindle capable of running up to 14,000 rpm.
CHALLENGE
When this Daewoo DHP 5000 spindle arrived at Northland Tool and Electronics we disassembled it and performed a full evaluation on it. Upon inspection, we found that the #3 bearing outer race broke into several pieces causing the spindle to lose preload. This in turn allowed the inner spacer to spin on the shaft and become damaged. We also noted that the gripper fingers were worn and would need to be replaced. The critical dimensions (bearing journals, housing, taper, etc.) were then measured and we found a few things out of ISO. First, the front and rear journals were out of ISO (ISO allows +/-4). The front journal was +3/-30 and the rear journal was +2/-19. Second the taper was worn and had 6 microns of runout. No other dimensional deviations were found.
SOLUTION
The following actions were performed on this Daewoo DHP 5000 spindle:
- Clean, inspect overall dimensions
- Replace bearings
- Replace grippers
- Grind chrome plate and regrind front and rear journals
- Kiss grind taper
- Manufacture a new inner bearing spacer
RESULT
After reassembly of all components, adjusting bearing preload, and undergoing break-in and testing procedures, this spindle passed our final quality inspection before being returned to our customer with a 1-year warranty.
DETAILED CAUSE OF FAILURE
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Repair History - Here are examples of similar spindle repairs that may contain additional information that will help you. If you have additional questions, please contact us.
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